Never fails 4 me . fill the seatpost tube with boilng water then add the caustic

But b carefull as it will b volatile

Leave 4 a day the swill out with boiling water . Refill and repeat till gone

takes bollox 2 use boiling water on caustic but it works

I'm mad so it helps a little

garage is under the bathroom

was well in the good books when i did it

Misses was a bit upset by the smell etc
ask dordy his on his GT was hammered 2 the bottom and I got the lot out